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我正在創建一個簡單的平臺遊戲。我正在嘗試創建與對象的碰撞並能夠檢測這些碰撞。通過下面的代碼，我無法正確檢測碰撞，並在碰撞時阻止玩家移動。應該發生的是代碼應該檢查是否與level.Objects數組中的任何對象發生衝突。我現在的代碼沒有檢測到碰撞，並且你落入地下無限。我將如何創建一個函數來正確檢測碰撞並在碰撞的哪一側返回true？更好的2D畫布碰撞檢測
function runGame() {
var game = document.getElementById('game')
var ctx = game.getContext("2d")
var DonaldRest = document.getElementById('DonaldRest')
var GrassTile = document.getElementById('GrassTile')
var gravity = 0.5
var momentum = 0;
var momentumDown = 0;
var spacing = 64;
var speed = 2;
var maxSpeed = 2;
var jumpHeight = 3;
var levels = [{
Name: "Level 1",
Objects: [{
Type: "GrassFloor",
Location: {
x: 0,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 1,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 2,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 3,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 4,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 5,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 6,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 7,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 8,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 9,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 10,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 11,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 12,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 13,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 14,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 15,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 16,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 17,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 18,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 19,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 20,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 21,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 22,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 23,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 24,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 25,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 26,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 27,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 28,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, {
Type: "GrassFloor",
Location: {
x: spacing * 29,
y: 0
},
Scale: {
x: 1,
y: 1
},
Solid: true,
Height: 3
}, ]
}]
var player = {
position: {
x: 0,
y: 0
},
Time: 0
}
ctx.canvas.width = window.innerWidth;
ctx.canvas.height = window.innerHeight;
var game = setInterval(function() {
ctx.imageSmoothingEnabled = false
ctx.clearRect(0, 0, window.innerWidth, window.innerHeight);
ctx.fillStyle = "#adfffa"
ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height)
ctx.drawImage(DonaldRest, ctx.canvas.width/2 - (96/2), ctx.canvas.height/2 - (96/2), 96, 96)
var Level = levels[0]
var Objects = Level.Objects
var OnGround = checkCollisions().Bottom
if (OnGround == false) {
if (momentumDown <= maxSpeed) {
momentumDown -= gravity;
player.position.y += momentumDown;
} else {
player.position.y += momentumDown;
}
} else {
momentumDown = 0;
console.log("collided")
}
for (var j = 0; j < Objects.length; j++) {
if (Objects[j].Type == "GrassFloor") {
ctx.drawImage(GrassTile, Objects[j].Location.x - player.position.x, (ctx.canvas.height - spacing + player.position.y) - (spacing * Objects[j].Height), spacing, spacing)
for (var i = -5; i < Objects[j].Height; i++) {
ctx.drawImage(DirtTile, Objects[j].Location.x - player.position.x, (ctx.canvas.height - spacing) - (i * spacing) + player.position.y, spacing, spacing)
}
}
}
}, 17); //17
$(document).keydown(function(e) {
if (e.which == 32) {
if (checkCollisions().Bottom == true) {
console.log(momentumDown);
momentumDown -= jumpHeight
console.log(momentumDown);
}
}
})
function isTouchingFloor(e1, e2) {
return e1.x < (e2.x + e2.w) && (e1.x + e1.w) > e2.x && e1.y - momentumDown < (e2.y + e2.h) && (e1.y - momentumDown + e1.h) > e2.y;
}
function checkCollisions() {
var Objects = levels[0].Objects;
var Collision = {
Top: false,
Left: false,
Bottom: false,
Right: false
}
var GrassTileImg = new Image()
var o1 = {
y: player.position.y,
h: 96,
x: player.position.x,
w: 96
}
for (var i = 0; i < Objects.length; i++) {
var o2 = {
y: Objects[i].Location.y,
x: Objects[i].Location.x,
h: 64,
w: 64
}
if (isTouchingFloor(o1, o2) == true) {
Collision.Bottom == true;
}
console.log(Collision.Bottom)
}
return Collision
}
}